We could succeed in producing the high-density and homogeneous molded objects of CoCrFeNiTi-based high-entropy alloy by using selective electron beam melting (SEBM), which exhibited high tensile strength and high corrosion resistance in a 3.5% NaCl solution. However, the ductility was not sufficient because of excessive Ni3Ti intermetallic compound precipitates with basket-weave morphology. We solved Ni3Ti compounds into the matrix by solution treatment. As a result, the ductility markedly improved without decreasing the strength, which was ascribed to the presence of very fine single cubic ordering precipitations in the face-centered cubic matrix. Furthermore, corrosion resistance also greatly improved because of the uniform composition by the uniform precipitation of very fine particles. The solution-treated SEBM specimens exhibited both high strength and high pitting potential, which in combination are superior to the conventional alloys.